I think his comment on Mac OS and Linux are perfect:
1) "Mac OS is really good for the things that are easy to do on it. Apple put alot of effort into making certain asspects easy and stable. Everything else, you don't want to do jedi mind trick wave."
2) "I've never had problems with Linux, EVER, I know where everything is, what programs start, what is on it, etc... the only thing is I've never used Linux as a desktop."
And of course my take:
When buying a computer, does not matter what computer and for what reason, KNOW YOUR REASON FOR BUYING IT. I tell my friends, my wife, anyone who asks me, "If you are buying a laptop buy one that is CHEAP and accomplishes what you need to do, don't get 100000gb of ram and a Pentium 4 processor (just an exaggeration)." The same goes with the operating systems. Know what you are using it for, what works on it, what works well on it, and who is using it. I tell my friends "you can get windows vista, but don't ask me for help configuring it since I don't know it" because I know they will ask. And to them the coolness and ease of vista does not outweigh the need to be able to ask for help.
1 - Why do you want Mac? Because you saw those mac commercials? Then get a mac and live in a fantasy world.
2 - Are the developers you want to hire going to want to learn the OS you chose? People can get turned off at the fact that they use windows at home, mac at work, and don't feel like learning another OS. Do NOT get frustrated at people asking the same questions over and over about configuring the OS. It takes time to get used to it. Like driving a Honda Civic vs driving a Ford Expedition, people need time to get comfortable.
3 - Do you ALREADY know someone who can support the OS of choosing? If not then your company is in serious trouble. You WILL run into OS problems. I know how to solve windows problems, not mac problems, so if I was to get a mac there is a learning curve before I can solve problems as well as I can on windows.
4 - Are there applications for the OS of choosing that you want/need to use? If you are using eclipse, then whatever, you can run VM to emulate IE6/7. If you care about TextMate like it is your only oxygen supply, then you better go mac. If you want the nifty linux commands, then download cygwin OR unixutils (http://unxutils.sourceforge.net/). Don't pick the OS before you pick the tools. The tools are your lifeblood, the OS is your heart. If your heart can't pump the composition of your lifeblood then its worthless and you are dead.
5 - Linux does not save you money.
Unfortunately windows has a grip on us. And don't fight it "just because". I actually thing while MS is evil Apple is 10x worse. So shed those personal beliefs and think what is best for the company, not "cool".